使用新值

Question

global file_platform
file_platform='karbarge.DAT'
Dir=30
Hs=4
Tp=12
dummy=[]
newval=[Dir, Hs, Tp]
def replace():    
    oldval=[]    
    line_no=[]
    search_chars=['WaveDir', 'WaveHs', 'WaveTp']
    with open(file_platform) as f_input:
        for line_number, line in enumerate(f_input, start=1):
            for search in search_chars:
                if search in line:
                    first_non_space = line.strip().split(' ')[0]
                    x=search_chars.index(search)
                    dummy.append((search, first_non_space, line_number, x))
                    print (search, first_non_space, line_number, x)

    i=0
    j=0
    for line in fileinput.input(file_platform, inplace=1):
        print (i)
        if i==eval(dummy[j][2]):
            line = line.replace(eval(dummy[j][1]),str(newval[dummy[j][3]]))
            j=j+1
        sys.stdout.write(line)
        i=i+1

    return
replace()

目标是根据文件中的关键字选择第一个非空格值，并将其附加索引。然后使用索引将其替换为具有新值的同一文件。我成功地选择了文件中的现有值，但可以相应地替换新值并将其保存在相同的文件名中。这是代码，我试过。 任何人都可以建议修改它们或建议一个简单明了的更好的代码。？

Answer 1

老实说，我没有理解你100％的目标，但我想提出一个更适合你需求的清洁解决方案。主要思想是获取旧文件的每一行，相应地替换值，将结果行存储在列表中，最后将这些行列表存储在新文件中。

# This dict associates the old values to the values to which they should be changed
replacing_dict = {'WaveDir': Dir, 'WaveHs': Hs, 'WaveTp': Tp}

new_lines = []
with open(file_platform) as f_input:
    for line in f_input:
        first_non_space = line.strip().split(' ')[0]
        if first_non_space in replacing_dict:
            line.replace(first_non_space, replacing_dict[first_non_space])

        new_lines.append(line)

# Write new_lines into a file and, optionally, replace this new file for the old file